Canal Zone, Dec. 12, 1904, 10c yellow Map stamp, carmine PANAMA overprint, 6th printing (#13, 6P) tied by 7-line CANAL ZONE killer with LA BOCA, 7-5-1906, handstamp (Rg-4) on REGISTERED cover with Cristobal Registry Exchange Label handstamp (RgXL-3) to United States with Cristobal (7-5), New York (7-13) & Montpelier, VT (7-14) backstamps. Fresh & Attractive Registered cover. Ex-Gibbs. Scarce Postal History item.